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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b658723548d79a45db4c2f085e4497f0d8b584eec9196c753436b160c15f9c1' 
  AND token = '7hZCFt9Jsm1HT4X4TPHnbWZRs9F2Cn8O3Z2qgR7Ny+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}